Live collaborative rooms
Share a 5-character code. Presence, status signals, chat and independent editors for every participant.
Turn interview prep into a multiplayer game — open live rooms, design LLD & HLD together, earn XP and ByteCoins, and unlock expert reviews (plus FAANG-style mentorship coming soon).
Strategy pattern is a good call — extract Level allocation behind an interface to keep it open for extension.
Line 4: name the strategy per vehicle type; interviewers probe this.
Today's interview problem
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Pick a problem, share a code, and design with others — collaboration is the main game loop.
AI review is instant. Community and Top Reviewers add real engineering perspective.
Rank up by contributing. BC unlocks Top Reviewers today — resume reviews & 1:1 sessions soon.
The game loop
The main loop is simple: open a live room, design together, ask for help, review each other — and earn XP plus ByteCoins as you contribute.
Create or join a room
Pick a problem, share a 5-character code, and practice LLD or HLD with others in real time.
Collaborate & ask for help
Chat, compare approaches, and unblock each other — the same muscle you need in interviews.
Get reviewed & level up
AI review for instant feedback. Human reviews when you want engineering perspective.
Earn XP & ByteCoins
Better designs, helpful reviews, and room contributions move your rank and wallet.
One workspace for writing designs, reviewing them, and proving you can explain them.
Share a 5-character code. Presence, status signals, chat and independent editors for every participant.
Design a parking lot or a global feed. Solo practice or a full room — the workspace is the same.
Architecture, OOP, SOLID and trade-off feedback in seconds, scored like a Staff-engineer bar raiser.
Request a proven reviewer for line-anchored comments and suggested diffs on your submission.
Earn BC in rooms and reviews. Spend on Top Reviewers today — resume deep-dives & FAANG-style 1:1s coming soon.
Every solve, review and helpful answer moves your level, streak and leaderboard rank.
Skill bars per topic, every submission archived, and reviewer comments reopenable in the editor.
Filter by type, difficulty, topic and status, or take the daily challenge for bonus XP.
Ranks reflect engineering contribution and trust — not just activity. Solve problems, help others, and build reviewer reputation as you level up.
AI gives you fast automated feedback. Human reviewers give you context, experience, and discussion — together they accelerate learning.
ByteCoins reward people who help others learn. Spend them on Top Reviewers and reference solutions today — and soon on 1:1 sessions and deep resume reviews with senior engineers from top companies.
One expert review
Starter pack
Interview sprint